Question

The age of the universe is thought to be about 14 billion years. Assuming two significant figures, write this in powers of ten in (a) years, (b) seconds.

Answer 1

well for scientific notation you want your number to be greater than 1 and less than 10 (usually), so it would be 1.4*10^x so all you need to do is count the zeros.

For the other parts, just use the number of days in a year, number of hours in a day, minutes in hours... just keep multiplying though.